> If you pick up the wrong jarful of bees there may be a wrong conclusion?
True.  It is important to collect the bees from within the brood chamber
where chances are highest that you will choose young bees/nurse bees most
likely to harbor mites.  The goal is not to get an exact count of mites in
the colony, rather an indication of the degree of mites' presence.

Aaron Morris - still thinking math rules!